Interleukin-36 alpha (IL36A), IL36B and IL36G are collectively known as IL36. They are members of the Interlukin-1 family that signal through a receptor composed of Interleukin-1 receptor-like 2 (IL1RL2, IL36R) and Interleukin-1 receptor accessory protein (IL1RAP, IL-1R/AcP) to promote inflammatory responses. Interleukin-36 receptor antagonist protein (IL36RN, IL36Ra) is a natural antagonist. IL36 is expressed predominantly by epithelial cells and is implicated strongly through functional and genetic evidence in the pathology of psoriatic disorders.